Environmental protection is another key element that provincial exhibits will emphasize. Channels have been built around the park to collect rainwater.

For Zhejiang province, the design of the garden park was guided by its invaluable assets of lucid waters and lush mountains, and new varieties and technologies of plants will be showcased.

Paper cutouts of stained glass windows, and brick and wood carvings provide a sense of traditional decorative elements in Guangdong province.

Some specialty stones from around the country will also stand on a grand square that connects different gardens, said Lu Feng, director of the bureau's exhibition investment department.

The stone from Jiangxi province is blue and white, representing the famous blue and white porcelain of the province's Jingde town. Stone from the Tibet autonomous region will be a testimony to Mount Qomolangma (Mount Everest).

China has become the largest flower producer in the world, with a planting area reaching 14,000 square kilometers in 2017 and sales of 153.3 billion yuan ($22.5 billion) last year.

This is the second time China has hosted a high-level horticulture expo. Kunming, Yunnan province, hosted the expo in 1999.

Visitors can enjoy more than 2,500 cultural activities, including parades, throughout the expo.